Maximum Voltage Drop

We are upgrading the power in our server room, and the question has come up about voltage variance to a DL580 (along with other servers 7000's, DL360's, 1600's ...).

I haven't been able to find any documentation on the website as to the maximum sustained voltage drop a server could take and still keep on running.

We will be running all of our servers on High Voltage (208V). The power will be coming in from the Utility company to a large UPS system. The UPS system will then distribute the power to 2 separate large PDU's from which the floor outlets (circuits) come from. From the outlets we will use both Dual Input and Single input Compaq PDU's to plug the servers into.